Reamer



C. C. BUBK.

REAMER.

APPLICATION FILED FEB-8.1919.

Patented Mar. 21, 1922.

w m w UNITED STATES PATENT oFrieE.

CLARENCE C. BUCK, 0F CLEVELAND, OHIO, ASSIGNOR TO THE STANDARDTOOL COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIO.

REAMER.

Application filed February 8, 1919. Serial No. 275,721

To all whom it may concern:

Be it known that I, CLARENCE C. Boon, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Reamers, of which the following is a specification, the principle of the invention being herein explained and the best mode in which'I have contemplated applying that principle, so as to distinguish it from other inventions.

The present invention relating, as indicated, to reamers, is particularly concerned with a built-up reamer constructed with a special view to cheapening the cost, while affording the solidity and cutting qualities of a solid or one-piece reamer such as has been used in the past. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. 1 is a side view of my improved reamer; Fig. 2 is an end view of the same; Fig. 3 is a transverse section on the line 3-3 of Fig. 1; and Fig. 4 is a similar transverse section but showing a modified construction.

I am aware that it has heretofore been proposed to construct reamers by taking a bar of soft steel, milling a series of parallel spaced longitudinal slots in the body of the bar. and then inserting in these slots :1 series of tool and high speed steel blades, which are then either forced into a tight engagement with the walls of the recesses by an expanding member, or are brazed or soldered therein by the usual means. The obvious advantages of such a reamer are that the cost is greatly reduced, as the only expen sive high speed or tool steel which need be used is in the blades, and as these are the only parts of the reamers which are in operative contact with the work it is these parts only that need to be of this quality of steel. The disadvantage of this type of reamers, as constructed in the past, has been due to the diiiicultyof securing a homogeneous and uniform joint. between the blades and the walls geneous juncture between the body of the reamer and the blades, with the result that in use the blades are pulled away from the backing of the recesses, and in a short time they are so loose that they come out or fail to do perfect work.

In my improved reamer I first mill out a, series of slots 1 in a solid bar of cheaper steel 2, the slots, of course, being usually disposed at equidistant intervals and in a parallel relation. Adjacent to these slots are formed recesses 3. Into the slots 2, I then insert blades 4 of rectangular cross section and of high speed cutting tool steel. The blades are constructed to require a driving fit between them and the recesses 1, and they are thus held firmly in these recesses even when first inserted.

The next step in the manufacture of the reamer is the joining of the blades to the body of the bar, and this juncture I make electrically by welding at a series of points along the flange or common side walls of the slots 2 and recesses 3. It will be seen from Fig. 3 that this wall or flange 5 of each of the recesses is extended upward to substantially the level of the top of the inserted blade 4, and of course this wall is the rear ward wall of the slot, that is, the wall be hind the blade and the one against which the blade exerts pressure when turning in the usual counter-clockwise direction. In order to secure a weld between this backing wall and the blade, suitable electrodes are placed at adjacent points against the rear wall of the projecting side 6 of the recess and upon the inserted blade 4, and a current is passed through the contacting surfaces between these two points, with the Patented Mar. 21', 1922.

of the recesses. Neither soldering nor brazing gives a homo-- result that a homogeneous union is secured between the metal of the backing wall and the blade at two or more points along the edge of the backing wall. One or more welds may be made along the edge of the backing wall and usually two points of union will be found sufficient to secure the desired strength when the blades are of the usuallength.

In Fig. 4 I have shown a slightl modified form of reamer, in which the backing blades and the metal at the bar itself is sufficient to give as much strength and as good service. as it is possible to secure with a solid reamer. After theconstruction of the reamer as described above, theentire end or portion in which the bladeshave been inserted may be properly heat treated,

tempered and finished.

Other forms may be em loyed embodying the features of my invention instead of the one here explained, change being made in the form or construction, provided the ele ments stated by the following claim or the equivalent of such stated elements be employed, whether producedby my preferred method or by other embodying steps equivalent to those stated in the following claim.

I therefore particularly point out and distinctly claim as my invention A realner comprising a soft steel body having longitudinal slots therein, a series of cutting blades snugly engaged in such slots and portion of the wallsof eachsu'ch slots being thinned and integrally joined to the adjacent blades. Y

Signed by me, this 41th day of February,

CLARENCE C. BUCK. 

